Camel

• 1. Introduction

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  Camel bones unearthed in Timna Valley, Israel, dating to around 930 BC, set off a wave of headlines when archaeologists Lidar Sapir-Hen and Erez Ben-Yosef published their findings between 2009 and 2013. Those bones were not just old -- they were a challenge to long-held assumptions about biblical history. If domestic camels didn't arrive in the southern Levant until the last third of the 10th century BC, then the stories of Abraham, Jacob, Esau, and Joseph, all of which feature camels prominently, were written after the fact. What started as a dig at a copper smelting site became an argument about scripture, time, and the animals that shaped civilizations. But the camel's story stretches far longer than any biblical narrative. It begins in the woodlands of what is now South Dakota, some 40 to 50 million years ago, with a creature called Protylopus -- roughly the size of a rabbit. How that small animal became one of the most indispensable working mammals on earth, surviving extinction while its North American relatives vanished, is a journey across continents, centuries, and extremes of heat and thirst that very few creatures could endure.

• 2. Forty Million Years in the Making

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  Protylopus, the earliest known camel ancestor, lived in North America during the Eocene epoch, 40 to 50 million years ago. It shared its woodland habitat with animals nothing like today's camels. By around 35 million years ago, a descendant called Poebrotherium had grown to roughly the size of a goat and showed more recognizable camelid traits. Around the same period, the hoofed Stenomylus walked on the tips of its toes, and the long-necked Aepycamelus emerged during the Miocene. The split between the lineages that produced today's Old World camels and New World camelids -- llamas, alpacas, vicunas, and guanacos -- is estimated to have occurred more than 16 million years ago. The ancestor of modern camels, Paracamelus, crossed from North America into Eurasia via the Bering land bridge between 7.5 and 6.5 million years ago. Some populations of Paracamelus lingered in the North American Arctic into the Early Pleistocene; this creature is estimated to have stood around 9 feet tall. During the Pleistocene, roughly 3 to 1 million years ago, North American camelids moved south through the newly formed Isthmus of Panama and gave rise to guanacos and their relatives in South America. The Bactrian camel diverged from the dromedary about 1 million years ago, according to the fossil record. Then, between roughly 13,000 and 11,000 years ago, the last camel native to North America, Camelops hesternus, disappeared alongside horses, mammoths, ground sloths, and sabertooth cats as part of the Quaternary extinction event, coinciding with the arrival of humans from Asia.

• 3. Bodies Built for Extremes

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  A full-grown dromedary stands 1.85 meters at the shoulder and reaches 2.15 meters at the hump. Bactrian camels can stand a foot taller and weigh anywhere from 300 to 1,000 kilograms. Both species can run at up to 65 km/h in short bursts and sustain 40 km/h over longer stretches. The physiology that makes them remarkable, though, has little to do with speed. The hump is a reservoir of fatty tissue, not water. When that fat is metabolized, it releases a mass of water greater than the fat itself -- but the breathing required to complete that metabolic process also evaporates water from the lungs, producing a net decrease in hydration in dry conditions. The camel's true water management happens elsewhere. A dromedary can go as long as 10 days between drinks under very hot conditions, losing up to 30% of its body mass through dehydration. Most other mammals experience cardiac failure after losing just 12 to 14% of their body weight in water; camels can withstand losses of up to 25%. When they do drink, they can consume as much as 30 imperial gallons in one session, and that water is stored in the bloodstream. Their red blood cells are oval rather than circular -- an unusual trait among mammals -- which prevents them from rupturing under the high osmotic pressure of rapid rehydration. Body temperature fluctuates between 34 degrees Celsius at dawn and 40 degrees Celsius by sunset, reducing the need to sweat. At ambient temperatures of up to 49 degrees Celsius, camels rarely sweat at all; when they do, the moisture evaporates at the skin level rather than the coat surface, drawing heat from the body rather than the surrounding air. A rete mirabile, a dense web of arteries and veins near the brain, uses countercurrent blood flow to keep the brain cool. On a typical day, camels lose only 1.3 liters of fluid, compared to 20 to 40 liters for other livestock. Ground temperatures in desert environments can reach 70 degrees Celsius; the camel's long legs keep its body well above that surface. When it lies down, a pad of thick tissue over the sternum called the pedestal lifts the body off the hot ground.

• 4. Immune Systems and Hidden Antibodies

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  In 1993, researchers discovered something unusual in camel blood. Standard mammalian antibodies are Y-shaped molecules built from two long heavy chains and two shorter light chains. Camels produce all of those, but they also carry a second type of antibody made entirely of two heavy chains, with no light chains at all. These smaller, more durable molecules are now known as heavy-chain-only antibodies. Scientists believe they evolved around 50 million years ago, after camelids separated from ruminants and pigs. Their compact structure allows them to reach molecular targets that standard antibodies cannot, a property that has attracted significant interest in medical research decades after their discovery. The camel genome also presents its own complexities. A 2007 study that flow-sorted camel chromosomes confirmed that camels have 37 pairs of chromosomes -- 74 in total -- arranged as one metacentric, three submetacentric, and 32 acrocentric autosomes, with a small metacentric Y chromosome and a large metacentric X. Across camelid species, karyotypes have been studied for years without researchers reaching a consensus on chromosome naming conventions. The wild Bactrian camel separated from the domestic Bactrian roughly 1 million years ago according to molecular data, while New World and Old World camelids diverged about 11 million years ago -- yet all these lineages can still interbreed and produce viable offspring. The cama, a hybrid of a camel and a llama, was bred by scientists using artificial insemination, with semen collected from a camel and a llama stimulated to ovulate via gonadotrophin injections. The cama is intermediate in size, lacks a hump, and has ears shaped between those of both parents, along with partially cloven hooves. Like a mule, the cama is sterile, despite both parent species sharing the same chromosome count.

• 5. Domestication and Its Discontents

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  Dromedaries may have been domesticated first in Somalia or South Arabia sometime during the third millennium BC. The Bactrian camel appears to have been domesticated around 2,500 BC, with evidence from Shar-i Sokhta -- also known as the Burnt City -- in Iran. A 2016 study using genome sequencing of modern and ancient mitochondrial DNA pointed to the southeast Arabian Peninsula as the likely origin for dromedary domestication. Historian Martin Heide, writing in 2010 and again with Joris Peters in 2021, concluded that humans had domesticated the Bactrian camel by at least the middle of the third millennium BC, somewhere east of the Zagros Mountains, with the practice spreading into Mesopotamia from there. The Timna Valley excavations placed the arrival of domestic camels in the southern Levant no earlier than the last third of the 10th century BC. Researchers connected this timing to the campaign of Pharaoh Shoshenq I and a major reorganization of the region's copper industry, raising the possibility that camels were introduced specifically to improve trade efficiency. The archaeologist William F. Albright had already argued, writing even earlier than Heide, that camel references in the Bible represented an anachronism. Richard Bulliet, a historian, held a similar view: the occasional mention of camels in biblical texts did not mean the animals were common in the Holy Land at those times. What the Timna bones revealed was a concrete, stratigraphically grounded date -- one that made those scholarly debates suddenly concrete for a wide public audience.

• 6. Soldiers, Saddles, and Camel Corps

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  By at least 1200 BC, the first camel saddles had appeared, and Bactrian camels could be ridden using a saddle positioned toward the animal's back, with a stick used to guide the animal. Between 500 and 100 BC, Bactrian camels entered formal military use, with new rigid saddles designed to distribute a rider's weight across both humps. The military Arabian saddle evolved in the seventh century BC, refining the design further. The first documented use of camel cavalry occurred at the Battle of Qarqar in 853 BC. The Achaemenid Persians used camels against Lydia at the Battle of Thymbra in 547 BC, exploiting the fact that horses are frightened by the scent of camels. The East Roman Empire recruited auxiliary camel soldiers called dromedarii from desert provinces, using them primarily in close combat. Military camel units appeared across centuries and continents. The United States Army established the U.S. Camel Corps in California in the 19th century; in 1858, Secretary of War John B. Floyd recommended funding to acquire a thousand more animals after the experiment was judged a success. The outbreak of the American Civil War in 1861 ended the program. France created a méhariste camel corps in 1912 as part of the Armée d'Afrique, and the Free French Camel Corps fought in World War II; camel-mounted units remained in French service until the end of French rule over Algeria in 1962. Britain formed the Imperial Camel Corps in 1916 to fight the Senussi and later deployed it in the Sinai and Palestine Campaign. The Corps was formally disbanded in 1919. The British also created the Egyptian Camel Transport Corps during World War I, staffed by Egyptian camel drivers who moved supplies across Sinai, Palestine, and Syria. Soviet units operating around Astrakhan in 1942 adopted local Bactrian camels as draft animals due to shortages of trucks and horses; despite severe losses, some of those camels ended up as far west as Berlin. The Border Security Force of India still uses camel cavalry today.

• 7. Food, Fiber, and Festival

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  Desert tribes and Mongolian nomads have used camel hair for tents, yurts, clothing, bedding, and accessories across generations. Guard hairs can be felted into waterproof coats, while the softer inner down goes into premium garments. Pure camel hair appeared in western clothing from the 17th century onward. From the 19th century, blends of wool and camel hair became common. The FAO commissioned Professor J.P. Ramet of the Ecole Nationale Superieure d'Agronomie et des Industries Alimentaires to develop methods for making camel cheese, since standard rennet cannot coagulate camel milk proteins. In the 1990s, Ramet succeeded by adding calcium phosphate and vegetable rennet; the resulting cheese is low in cholesterol and digestible even for the lactose intolerant. Nomads can subsist almost entirely on camel milk for close to a month. Approximately 3.3 million camels and camelids are slaughtered for meat worldwide each year. A male Bactrian carcass can weigh up to 650 kilograms. The hump is considered a delicacy; camel meat is reported to taste like coarse beef, and the Roman emperor Heliogabalus was recorded as enjoying camel's heel. In Karachi, Pakistan, nihari is prepared from camel meat. The Abu Dhabi Officers' Club serves a camel burger mixed with beef or lamb fat to improve texture. Ancient Greek writers described camel roasted whole as a dish served at banquets in ancient Persia. The annual King Abdulaziz Camel Festival in Saudi Arabia holds a beauty pageant with prize money of 57 million dollars. In 2018, twelve camels were disqualified after their owners were found to have used botox injections to alter their appearance; a similar incident in 2021 saw more than 40 camels disqualified.

• 8. Distribution, Feral Herds, and Rock Art

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  Approximately 14 million camels are alive today, with 90% being dromedaries. The Horn of Africa holds the largest concentration of camels in the world; in Somalia and Ethiopia, dromedaries provide milk, food, and transportation for nomadic communities. Over one million feral dromedaries roam Australia, descended from animals imported for transport in the 19th and early 20th centuries. That population was growing at about 8% per year and was estimated at 700,000 in 2008. The Australian government has culled more than 100,000 animals partly because the camels compete with sheep farmers for scarce water and vegetation. Twenty-five camels were also exported from the United States to Canada during the Cariboo Gold Rush. The wild Bactrian camel numbers approximately 950 individuals, confined to the Gobi and Taklamakan Deserts in China and Mongolia. It is a distinct species not ancestral to the domestic Bactrian camel, and is classified as critically endangered. What may be the oldest known carvings of camels were discovered in 2018 in Saudi Arabia. Analysed by researchers across several disciplines, the carvings were estimated in 2021 to be 7,000 to 8,000 years old -- older than Stonehenge by roughly two millennia and older than the Egyptian pyramids at Giza by around two and a half thousand years. Dating rock art is difficult because the carvings themselves contain no organic material; researchers instead tested associated animal bones, assessed erosion patterns, and analysed tool marks. That Neolithic date predates the earliest estimates for camel domestication, suggesting that human beings were depicting camels in stone long before they put them to work.